Go to your server settings and make sure the RainbowBOT Role is at the top of all roles in your server
eg.

Make sure the Role you want to change colours is @mentionable
eg.

Make sure the rainbow role is the highest coloured role on the users (otherwise the colour that will display will be the colour of a higher role)
eg.

Use either Rainbow Role Command (r.rainbow or r.colour) to setup the rainbow roles
6 for r.rainbow (simple)
7 for r.colour (advanced)

r.rainbow @role
Type r.rainbow and @ the role you want to have rainbow ie.

type r.colour then @role then some hex values of colours to set specific colours for the rolehttp://htmlcolorcodes.com/ go here for some hex colours
eg.

Enjoy The Rainbow Roles!!

FAQ
Q.Why is the time limit only 60 seconds?
A.To comply with discord API regulations we have limited the bots colour changing speed to once per 60 secondsQ.Why isnt it working when I use r.rainbow @user?
A.You can only mention a role to use the command because you can only change the colour of roles on discordQ.Does RainbowBOT have any more commands?
A.No, for a full list of commands type r.help or for a more feature packed bot with moderation, memes, NSFW, tags and more go here: https://goo.gl/iC5bAaQ.Can I download this bot?
A.Yes it is on github
Full Version: https://github.com/PassiveModding/RainbowBOT/releases
Source: https://github.com/PassiveModding/RainbowBOTQ.I am Having issues with the bot, I think there are errors with the config file
A.You can clear your guilds config file by typing r.clear